Damper



4N@ Model.)

S. lG. SEARIGHT.

DAMPER.

UNITED STATES PATENT OFFICE.

SAMUEL G. SEARIGHT, OF BUTLER, INDIANA.

DAMPER.v

SPECIFICATION forming part of Letters Patent-No. 435,125, dated August 26, 1890.

Application filed March l5, 1890. Serial No. 344,029. (No'model.)

To @ZZ whom t may concern:

Be it known that I, SAMUEL G. SEARIGHT, a citizen of the United States, resi-ding at But ler, in the county of De Kalb and State ofv Indiana, have invented a new and useful Damper, of which the following is a specification.

This invention has relation to improvements in dampers for stove-pipes and drums; and among the objects in view are to provide a damper so constructed as to permit of a direct draft when so desired and when the damper is closed to permit of an indirect draft, whereby the heat of the products of combustion may be radiated and not lost, by which a saving of fuel is readily obtained.

A further object of the invention is to provide means for increasing the capacity or openings for the indirect draft without in any way establishing a direct draft.

Vith these general objects in view the invention consists in certain features of construct-ion hereinafter speciiied, and particularly pointed out in the claims.

Referring to the drawings, Figure 1 is a vertical central section of a stove-pipe provided with a damper constructed in accordance with my invention. Fig. 2 is aperspective of the damper removed, the same being shown inverted. Fig. 3 is a detail in perspective of the box, the damper-plates removed. Fig. 4 is a detail in perspective of the lower damperplate.

Like numerals of reference indicate like parts in all the figures of the drawings.

The pipe 1 is provided with an internallylocated cast-metal oblong box 2, which box is secured therein as hereinafter described, and comprises two cast-metal sections 3. Each of the cast-metal sections is provided at its ends with inwardly-disposed flanges 4, the flanges of the one section extending below the lower edge of that section and the iiange of the opposite section extending above the upper edge of said opposite section, as clearly shown, and through said sections there is passed a securing-bolt 5, bound in position by a nut 6. The flanges 4 of each of the sections are provided with one-half of a central recess 7 and above and below said recess with one-half of a bearing-opening 8 and 9, respectively.

10 represents a semi circular damper-plate, which at opposite sides is provided with bearing-trunnons 11, which bearing-trunnions are pivotally mounted in the upper bearingopening il. The rear end of the damper-plate 10 projects sufficiently far in rear of the trunnions to close the space between the two boxsections when the damper is in a horizontal position. One side of the damper-plate is shouldered, as at 12, so that said shoulder rests upon the upper end of the side of the box and prevents the damper-plate from falling below a horizontal position. This upper plate 10 is adapted to fold over that one f the box-sections which has its side iianges 4 extended above its upper edge, so that when the plate is in a horizontal position it closes the space between the sections and forms the upper boundary for a space between the upper edge of the box-sections and itself.

Journaled in the lower bearings S) of the cast-metal box and projecting through opposite registering openings formed in the stove-pipe itself is a crank-shaft 13, provided at one extremity with a crank 14 for operating the shaft, and at the other extremity with threads, upon which is mounted a removable nut 15. The intermediate portions of the shaft are triangular in cross-section, and receiving the same are a pair of oppositely-located depending loops 16, correspondingly shaped and formed upon the under surface of the lower damper-plate 17, which plate is oppositely disposed to the upper plate 10, and

is semicircular in plan and has its rear por-` tion covering the lower end of the space or opening between the box-sections and combining with the lower edge of the box-section provided with the flanges which depend below its lower edge to form an opening when said damper is in a horizontal position, and said damper is also provided with a shoulder 18, designed to abut against the lower edge of one of said flanges for the purpose of preventing the damper-plate from being elevated above a horizontal position. The lower plate 17 is further provided with a depending loop or keeper 19 at its center, in which there is located the upperbent portion 2O of .a depending bell-crank-shaped arm 21, said upper bent portion being riveted, as at 22, to the damperplate and the bellcrankshaped arm projecting to the rear beyond the side wall of the box and into a vertical alignment with the upper damper-plate to which is connected by a bifurcated connecting-link 23, pivoted at its lower end, as at 24, to the extremity of the bell-crank-shaped arm, as at 25, to the lower extremity of a stud 26, depending from the under surface of the upper damper-plate I0.

As before stated, the two damper-plates are slightly more than semicircular in plan, and combined they would form a complete circle sufficient to entirely occupy the circular space bounded by the stove-pipe.

For purposes hereinafter apparent, I provide each of the semicircular plates at their edges outside or beyond their respective flanges 4 with curved tiangesl27, said flanges being inwardly disposed-that is to say, the flange of the upper damper being down- Wardly disposed and the flange of the lower damper being` upwardly disposed, all as clearly shown in the drawings. The edge of the flange is in this instance curved or gradually reduced in a curve-like manner toward its ends, so that the widest portion of each of the flanges 27 will be at the point farthest from the damper-box.

By operating the crank so as to bring the same to a vertical position it will be apparent that both damper-plates will be vertically disposed, and thus permitting of a direct and unimpeded draft for the upward movement of the products of combustion. By bringing the crank to a horizontal position it will be apparent that both damper-plates will assume a corresponding position and that the products of combustion will be prevented from passing upward beyond the damper.

It is often desirable to provide for a slight indirect draft, whereby the products of combustion are forced to radiate their `heat be'- fore escaping and yet at the same time to avoid any approach to a direct draft of said products, whereby a portion of the same would escape without any radiation whatever of their inherent heat. To accomplish this, therefore, I provide the flanges 27; and it will be apparent that the crank may be swung down a short distance, which will swing the circular edges of the opposite plates in opposite directions an'd away from the diametrically-opposite sides of the pipe, and were it not for these flanges 27 a direct draft-opening would be formed in the pipes; but with the flanges 27 provided at the circular edges of the plates it will be apparent that when such plates are but partiallyoperated or swung to a point intermediate a horizontal and vertical position the edges of the flanges will assume temporarily the functions of the dampers and will themselves take the place of the dampers, and while the rear ends of the dampers partially uncover the upper open ends of the boxes yet the flanges of the plates will be insuch position as to direct all products of combustion in a tortuous path through the openings in the boxes around under the dalnpers at their rear edges before they can escape, and by this time said products will have to a great extent radiated their heat.

A construction like the above avoids 'the storage of poisonous gases and their linal escape through the fuel-opening of the stove, and while serving every function of a coinplete cut-off-namely, the interruption of the complete draft-yet they permit of the escape of all poisonous gases arising from the combustion of fuel, but previous to such escape separate therefrom their caloric propertiesA and radiate the same into the room or compartment in which the stove pipe or drum may be located.

Having thus described my invention, what I claim isl. A damper for stove-pipes and heatingdrums, consisting of a box open at both ends and at diagonally-opposite sides, pivoted semicircular damper-plates mounted in the ends of the box, adapted to close the opposite end openings and project beyond that side of the box at which are located said diagonal openings, a crank-shaft for operating said plates, connections between the plates whereby an operating of one plate causes a similar operation of the other, and inwardly-disposed flanges provided at the semicircular portions of the plates, the edges of the flanges being curved, substantially as specified.

2. A damper for stove-pipes and drums, comprising a box open at opposite ends having their opposite sides at opposite ends exdisposed meeting flanges, in the edge of each of which flanges is formed halves of bearingopenings, a binding-bolt passed through the sections and connecting the same, opposite damper-plates, one of which is provided with trunnions taking in a pair of said bearings, and the other of which is provided with a pair of angular loops depending therefrom, an angular shaft mounted i-n the opposite pair of bearings and passing through the loops and terminating in a crank, and connections loosely connecting the two plates, substantially as specified.

3. 'Ihe combination, with a stove-pipe or heating-drum, of a cast-metal damper-boxhaving opposite bearings and upper and lower openings, a'crank-shaft mounted in the lower pairof bearings and in similarbearings formed in the stove pipe or drum, a similar circular damper-plate mounted on a shaft and closing the lower opening, a similar damperplate having trunnions mounted in the upper bearing-openin gs, connections between the two plates, and semicircular flanges secured to and inwardly disposed from the circular edges of said plates and reduced in a circular manner toward their extremities,

substantially as specified.

4. A damper for Stove-pipes and heatingdrums, consisting of a box, pivoted damper- IOO IIO

plates mounted in the ends of the box, a crankshaft for operating said plates, connections between the plates whereby an operating of one plate causes asimilar operation of the other, and inwardly-disposed flanges provided at the semicireular portions of the plates, the edges of the flanges being curved, substantially as specified.

5. A damper for stove-pipes and heatingdrums, consisting of a box made in opposite sections held together by bolts, pivoted damper-plates mounted in the ends of the box, a crank-shaft for operating said plates, connections between the plates whereby an operating of one plate causes a similar operation of the other, and inwardly-disposed iianges provided at the semicircular portions of the plates, the edges of the anges being curved, substantially as specified.

In testimony that I claim the foregoing as my own I have hereto affixed my signature in presence of two witnesses.

SAMUEL G. SEARIGHT.

Witnesses:

J. A. CAMPBELL, J. HAVERsToCK. 

